1
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

The mean and variance of the data $$4,5,6,6,7,8, x, y$$, where $$x< y$$ are 6 and $$\frac{9}{4}$$, respectively. Then, $$x^2-2 y$$ is equal to

A
8
B
32
C
0
D
4
2
BITSAT 2022
MCQ (Single Correct Answer)
+3
-1

The mean of five observations is 4 and their variance is 5.2. If three of these observations are 1, 2 and 6, then the other two are

A
2 and 9
B
3 and 8
C
4 and 7
D
5 and 6
3
BITSAT 2021
MCQ (Single Correct Answer)
+3
-1

For a random variable X, E(X) = 3 and E(X2) = 11. The variable of X is :

A
8
B
5
C
2
D
1
4
BITSAT 2021
MCQ (Single Correct Answer)
+3
-1

The sum of 10 items is 12 and the sum of their squares is 18, then the standard deviation will be

A
$$-$$3/5
B
6/5
C
4/5
D
3/5
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